Emotet Office (OLE) / .XLSX malware analysis — malicious · b2c79a9b27ba6552

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: baef85d9b08f15e7c13adf393fe5edc2 SHA-1: b41dc1e8253e1c8e704df1dfba4d6c643b5797da SHA-256: b2c79a9b27ba6552248f92c69a0bc8d7b52db75c2da1b0fbd4c28e482a9e2573

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is detected as malicious by ClamAV and exhibits high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution event and a CreateObject call. The VBA script contains obfuscated commands that reconstruct the following URLs for downloading payloads: 'http://midnighitsilverbcraft.com/store/wBjNOUwc/B110N4cQ6R3/', 'http://temp.com/NAT_05_22_2009/BI710N4cQ6R3/', and 'https://redington.karmat'. It also attempts to write a VBScript to 'c:\programdata\oue4hjld.vbs' and a batch file to 'c:\programdata\bhnasleil.bat', likely to execute the downloaded payload and establish persistence.

Heuristics 6

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `701f29925e3aedb5d6a10220a36fda1730eba839470d9bc792f1d384751dd8d7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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